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Headgasket trouble? 900 1997

posted by  Amarin on  Sat May 14 23:26 CST 2022
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last visit: Thu Oct 23 22:42 CST 2014
[RELATED]

Dear Metallo,


You wrote:
"Left the gasoline in there for about 25 mins., and came back. I noticed the intake valve of cylinder #4 leaked a few drops. All the others are sealed."

Actually you should have stayed and waited all the while.

Finding it leaked at end of 25 mins doesn't tell you what time it leaked. It could have leaked early, mid or late (ie the severity of leak)

In reality the valves are supposed to seal in split second during compression in a working engine. The reason to leave the gasoline for about 5 to 10 minutes during the test is because the gasoline wasn't under any pressure (only under influence of gravity) unlike in working engine.

I suggest you clean it all up with brake cleaner, let dry (use hairdryer) and REPEAT the test just to be sure.

This not to make you working harder than usual but to help you (and us) to decide.

If it leaked early (within a few minutes up to 5 minutes considered as severe leak) then lapping is a must IMHO


Amarin





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